Slow rate controlled ramp and its use in liquid crystal displays
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United States of America Patent
Stats
-
Dec 30, 2003
Grant Date -
Apr 24, 2003
app pub date -
Oct 22, 2001
filing date -
Oct 22, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An operational transconductance amplifier (OTA) circuit, and a liquid crystal display that uses such an OTA circuit, having a controlled slew rate. The OTA has an output that drives a load, beneficially a liquid crystal display panel. That OTA includes a first current source that sinks a first tail current, and a second current source that selectively sinks a second tail current. That second current source is selected by a control signal applied to a switch. When the second current source sinks the additional second tail current the slew rate of the OTA is increased. When used in a liquid crystal display, the OTA drives the liquid crystal display panel with a ramp. During ramp fly back, the second current source sinks the second tail current and increases the slew rate.
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